Finding the Fourth Proportional to 21,970.50, 30,317.79 and 12,411.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,970.50 : 30,317.79 = 12,411.87 : x
2. Step 2: Convert to fraction form
   21,970.50/30,317.79 = 12,411.87/x
3. Step 3: Cross multiply
   21,970.50x = 30,317.79 × 12,411.87
4. Step 4: Simplify right side
   21,970.50x = 376,300,468.17
5. Step 5: Solve for x
   x = 376,300,468.17/21,970.50
6. Step 6: Final answer
   x = 17,127.53